Not all laptops have glossy screens. And why are there glossy screens in laptops? Well, they are usually low'ish-end consumer-laptops. When consumers see those glossy screens, they think "ooooh, shiny", and they buy it. But that doesn't mean that it's actually better.
There's a reason why MacBook has a glossy screen, whereas MacBook Pro only offers it as a BTO-option.
surprise surprise someone disagrees with me in here
And I guess there's a reason why glossy screen is offered as a BTO.
Like I said I couldn't imagine doing any kind of design work on a laptop screen anyways...